A fabrication method of mechanically chirped long-period fiber gratings

Abstract

The invention discloses a manufacturing method for a mechanical chirp long-period fiber grating. The mechanical chirp long-period fiber grating comprises a heat-shrinkage tube, a heat-melting tube, two steel needles with chirp period threads and one optical fiber, wherein the steel needles are made into chirp threaded steel needles through thread machining; the chirp threaded steel needles are placed between the heat-shrinkage tube and the heat-melting tube by using an automatic needle inserting machine and an automatic tube shrinking machine; the two ends are pre-shrunk to finish the encapsulation; then the optical fiber is placed into the heat-melting tube; the heat-melting tube is heated by using a heat-shrinkage tube drying oven, so that the chirp threaded steel needles are pressed bythe heat-shrinkage tube; and the optical fiber is pressed by the chirp threaded steel needles to produce the chirp long-period fiber grating. The manufacturing method for the mechanical chirp long-period fiber grating has the advantages of simplified process, skilled process flow, low cost and stable performance.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and the field of manufacturing technology of optical communication passive devices, in particular to a method for manufacturing a mechanically chirped long-period fiber grating (MCLPFG). Background technique [0002] With the rapid development of economy and society, optical fiber technology has been greatly improved in recent decades, and more and more optical fiber functional devices have been studied in depth. Among them, the long-period fiber grating (LPFG) develops rapidly, stands out among many fiber passive devices, and leads the technological revolution in the field of information technology. Fiber Bragg Grating is a device whose core refractive index changes periodically. It is a spectrum selective element with small size, simple manufacture, and easy connection with other optical fiber devices. It can form a variety of all-fiber devices. Among them, the chirped long-period fiber gra...

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Problems solved by technology

[0005] In order to solve the problem of difficult manufacture of mechanically chirped long-period gratings (MCLPFG), the present invention provides a manufacturing method of mechanically chirped long-period optical fiber gratings with simplified process, mature process flow, low cost and stable performance

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